little legal issue with that lights

I have a 74 duster and I love it, but every time i drive it some where the law stops me and gives me a warning for not using my turn signal. All of my turn signals work properly they just arent very bright. I use them every where i go but ive come to find out that when im on the brake light sitting at a stop light or even when my lights are on you cant see them at all front or back. there just to dim but the function the way they should. I dont know what to do about this i have no idea what is causing it either. i have changes all the bulbs and put in new fuses, i just dont know what to do anymore. i want to drive my car but im afriad im gonna start getting tickets pretty soon. Please help.

thanx much